Chiapas is the southernmost state of Mexico. It is towards the southeast of the country. Chiapas is bordered by the states of Tabasco to the north, Veracruz to the northwest, and Oaxaca to the west. To the east Chiapas borders Guatemala, and to the south the Pacific Ocean.

Chiapas has an area of 28,528 square miles (73,890 km2). The 2005 census population was 4,293,459 people.

In general Chiapas has a humid, tropical weather. In the north, in the area bordering Tabasco, near Teapa, rainfall can be more than 3,000 mm (118 in) per year . In the past, natural vegetation at this region was lowland, tall perennial rainforest, but this vegetation has been destroyed almost completely to give way to agriculture and ranching. Rainfall decreases moving towards the Pacific Ocean, but it is still abundant enough to allow the farming of bananas and many other tropical crops near Tapachula. On the several parallel "sierras" or mountain ranges running along the center of Chiapas, climate can be quite temperate and foggy. This allows the development of cloud forests like those of the Reserva de la Biosfera el Triunfo, home to a handful of quetzals and horned guans.

Most people in Chiapas are poor, rural small farmers. About one quarter of the population are of full or predominant Maya descent, and in rural areas many do not speak Spanish. The state suffers from the highest rate of malnutrition in Mexico. This rate is estimated to affect over 40% of the population.

Other social issues involve the increasing presence of the Central American gangs known as Maras, and illegal immigration from Central America in general. This migration is mostly directed towards the United States, but it makes local poverty even worse. Many times, there are abuse and Human Rights violations that touch these migrants.

In 1994, there was an outbreak of violence between the Mexican Government and the Zapatista Army of National Liberation (the EZLN or Zapatistas). Today, the EZLN (Ejército Zapatista de Liberación Nacional, named in honour of Emiliano Zapata) has rejected the use of force and seek to be recognized as a voice of the poor. There are currently 32 "rebel autonomous zapatista municipalities" (independent Zapatista communities, MAREZ in Spanish), controlled by the EZLN in Chiapas: examples of these communities are Ocosingo and Las Margaritas.